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Net Income Per Share - Computations of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]    
Net income $ 186,841 $ 72,073
Shares used in net income per share computation:    
Weighted average shares outstanding - basic (in shares) 168,372 167,612
Effect of potentially dilutive equivalent shares (in shares) 3,648 2,515
Weighted average shares outstanding - diluted (in shares) 172,020 170,127
Net income per share:    
Basic (in dollars per share) $ 1.11 $ 0.43
Diluted (in dollars per share) $ 1.09 $ 0.42
Anti-dilutive equivalents shares excluded (in shares) 500 1,400